Enhanced Electrochemical Performance of Porous Electrodes for All-Solid-State Li-Ion Microbatteries

Abstract

Nowadays, lithium-ion batteries (LIBs) are widely used to power portable devices, microelectronics, vehicles, etc. With many advantages such as high surface area and improved charge transport, self-supported 3-D nanostructured metal oxides are promising electrode materials for LIBs and their impact is particularly significant when considering the miniaturization of energy storage systems and the development of 3D microbatteries [1-3]. During this talk, it will be presented the fabrication and use of porous electrodes based on titania nanotubes (TiO2nts) as anode [4–8] and LiNi0.5Mn1.5O4 (LNMO) as cathode. This kind of 3D nanostructured electrodes is particularly interesting due to better electrochemical performance in terms of kinetics and stability during cycling. Then, the fabrication of an all-solid-state Rocking-chair battery composed of vertical arrays of TiO2nts as anode, a polymer thin film as electrolyte, and a LiNi0.5Mn1.5O4 (LNMO) layer as cathode will be shown [9]. According to the electrochemical tests, this 2D full-solid microbattery exhibits high performance such as good discharge capacity and good capacity retention. Finally, the current approaches developed to achieve the fabrication of a full 3D microcell will be highlighted. Particularly, the conformal electrodeposition of polymer electrolytes onto the electrodes will be discussed [10-12].